Timers

Water is a precious commodity and increasingly expensive, so smart water use is not only good for the family budget, it helps prevent wastage. Waterproof timers can be attached to the outside of your tap to regulate sprinklers or irrigation systems and will fit standard 12mm hose connectors.
There are two types of timers: mechanical and electronic.
Mechanical timers feature a simple dial function that you turn to the number of minutes required. The timer will allow a flow of water for that time period and shut off automatically. Mechanical timer dial settings vary from one to two hours, allowing for plenty of time to freshen up the garden. Twin packs that run off one tap enable you to run dual hoses. 
Electronic timers are smart little computers that allow you to set the time, date and duration of watering. This will prevent over or under watering and means you can strike at the best time of day - just set and forget. They also offer a locking keypad function to avoid accidently wiping your settings.

Electronic timers use batteries. To ensure longevity, use the battery type stated in the instructions.
Advancements in technology have allowed manufacturers of electronic timers to produce an effective solar-powered model. The solar panel is positioned on top of the timer and must have daily exposure to sunlight. The sun will recharge the battery and give you up to five years running capability without additional costs. Look for your chance to win your very own solar-powered water timer on page 69 in this issue of How To magazine.
Another handy watering device is the Litre Meter, which clicks directly onto a spray gun or nozzle and efficiently measures and controls the amount of water you use. Set the dial to zero, turn the tap on and as the water flows the dial will turn, measuring the number of litres used. This can be especially useful if you have a water tank.

This handy How To chart shows you how much water an area needs:

AREA	1m sq	2m sq	5m sq	10m sq	20m sq
LITRES	10	20	50	100	200

 
The suggested minimum for most gardens is 10mm of water per square metre, equating to 10 litres of water.

Tricks of the trade: Always read the instructions. If you are on tank water, fit a filter before the timer to keep out sediments. Lock the settings panel once you have set your timer. Remove the timer from the tap during winter and remove the battery so it doesn’t corrode. To prevent damage to the timer, resist pulling hard on the hose when the timer is attached. Set watering times for the early morning when the household water is not being used.